[Balance] Moveset generation adjustments (#5801)

* Moveset generation adjustments

* Remove shiny explosion check, prevent 2 self-KO moves

src/field/pokemon.ts

@@ -3500,11 +3500,11 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       }
       let weight = levelMove[0];
       // Evolution Moves
-      if (weight === 0) {
+      if (weight === EVOLVE_MOVE) {
         weight = 50;
       }
-      // Assume level 1 moves with 80+ BP are "move reminder" moves and bump their weight
+      // Assume level 1 moves with 80+ BP are "move reminder" moves and bump their weight. Trainers use actual relearn moves.
-      if (weight === 1 && allMoves[levelMove[1]].power >= 80) {
+      if (weight === 1 && allMoves[levelMove[1]].power >= 80 || weight === RELEARN_MOVE && this.hasTrainer()) {
         weight = 40;
       }
       if (
@@ -3609,9 +3609,9 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
 
     // Bosses never get self ko moves or Pain Split
     if (this.isBoss()) {
-      movePool = movePool.filter(m => !allMoves[m[0]].hasAttr(SacrificialAttr));
+      movePool = movePool.filter(m => !allMoves[m[0]].hasAttr(SacrificialAttr) && !allMoves[m[0]].hasAttr(HpSplitAttr));
-      movePool = movePool.filter(m => !allMoves[m[0]].hasAttr(HpSplitAttr));
     }
+    // No one gets Memento or Final Gambit
     movePool = movePool.filter(
       m => !allMoves[m[0]].hasAttr(SacrificialAttrOnHit),
     );
@@ -3623,10 +3623,6 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
         m[0],
         m[1] * (allMoves[m[0]].hasAttr(SacrificialAttr) ? 0.5 : 1),
       ]);
-      movePool = movePool.map(m => [
-        m[0],
-        m[1] * (allMoves[m[0]].hasAttr(SacrificialAttrOnHit) ? 0.5 : 1),
-      ]);
       // Trainers get a weight bump to stat buffing moves
       movePool = movePool.map(m => [
         m[0],
@@ -3687,10 +3683,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     ]);
 
     /** The higher this is the more the game weights towards higher level moves. At `0` all moves are equal weight. */
-    let weightMultiplier = 0.9;
+    let weightMultiplier = 1.6;
-    if (this.hasTrainer()) {
-      weightMultiplier += 0.7;
-    }
     if (this.isBoss()) {
       weightMultiplier += 0.4;
     }
@@ -3699,8 +3692,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       Math.ceil(Math.pow(m[1], weightMultiplier) * 100),
     ]);
 
-    // Trainers and bosses always force a stab move
+    // All Pokemon force a STAB move first
-    if (this.hasTrainer() || this.isBoss()) {
     const stabMovePool = baseWeights.filter(
       m =>
         allMoves[m[0]].category !== MoveCategory.STATUS &&
@@ -3716,21 +3708,6 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       }
       this.moveset.push(new PokemonMove(stabMovePool[index][0], 0, 0));
     }
-    } else {
-      // Normal wild pokemon just force a random damaging move
-      const attackMovePool = baseWeights.filter(
-        m => allMoves[m[0]].category !== MoveCategory.STATUS,
-      );
-      if (attackMovePool.length) {
-        const totalWeight = attackMovePool.reduce((v, m) => v + m[1], 0);
-        let rand = randSeedInt(totalWeight);
-        let index = 0;
-        while (rand > attackMovePool[index][1]) {
-          rand -= attackMovePool[index++][1];
-        }
-        this.moveset.push(new PokemonMove(attackMovePool[index][0], 0, 0));
-      }
-    }
 
     while (
       baseWeights.length > this.moveset.length &&
@@ -3741,7 +3718,11 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
         // Other damaging moves 2x weight if 0-1 damaging moves, 0.5x if 2, 0.125x if 3. These weights get 20x if STAB.
         // Status moves remain unchanged on weight, this encourages 1-2
         movePool = baseWeights
-          .filter(m => !this.moveset.some(mo => m[0] === mo.moveId))
+          .filter(m => !this.moveset.some(
+            mo => 
+              m[0] === mo.moveId ||
+              (allMoves[m[0]].hasAttr(SacrificialAttr) && mo.getMove().hasAttr(SacrificialAttr)) // Only one self-KO move allowed
+          ))
           .map(m => {
             let ret: number;
             if (
@@ -3772,7 +3753,11 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
           });
       } else {
         // Non-trainer pokemon just use normal weights
-        movePool = baseWeights.filter(m => !this.moveset.some(mo => m[0] === mo.moveId));
+        movePool = baseWeights.filter(m => !this.moveset.some(
+          mo => 
+            m[0] === mo.moveId ||
+            (allMoves[m[0]].hasAttr(SacrificialAttr) && mo.getMove().hasAttr(SacrificialAttr)) // Only one self-KO move allowed
+        ));
       }
       const totalWeight = movePool.reduce((v, m) => v + m[1], 0);
       let rand = randSeedInt(totalWeight);
@@ -7104,7 +7089,6 @@ export class EnemyPokemon extends Pokemon {
 
     if (!dataSource) {
       this.generateAndPopulateMoveset();
-
       if (shinyLock || Overrides.OPP_SHINY_OVERRIDE === false) {
         this.shiny = false;
       } else {